2D hybrid perovskites are a promising class of materials for optoelectronic applications such as light emitting diodes, photodetectors and solar cells. Compared to the more researched 3D hybrids they have several advantages, including an improved stability in ambient conditions and the possibility of introducing functionality in the organic layer. So far, the organic layer is only used to tune their band gap, dielectric environment and dimensionality, while the transport of charge carriers remains restricted to the inorganic metal-halide octahedrals. In this work we aim at introducing functionality in the organic layer for instance to improve charge separation or tune the sensitivity of photodetectors. In general, there is a lack of understanding on how the organic cations affect the charge and excited state dynamics of 2D hybrid perovskites and whether the transport can be extended to the organic layer. In this work we use unique time-resolved microwave conductivity techniques, combined with time-resolved fluorescence and femtosecond transient absorption to study the charge and excited state dynamics of a large variety of 2D organic-inorganic perovskites. First, we have found that the thickness of inorganic layers highly affects properties such as mobility, yield of charge dissociation, exciton binding energy. Second, pure 2D perovskites (n=1) with different organic groups (BA, BZA, HA) exhibit new electronic transitions at low temperature that may be associated with different nature of the excitonic states (free exciton, biexcitons, trions). Finally, we have explored the possibility to adapt the organic cations, so that they start playing a role in defining the opto-electronic properties. It is, for example, possible to improve the charge transport to the organic layer through the formation of charge-transfer complexes between a charge-donating and charge-accepting molecule. We synthesized 2D hybrid perovskites containing a donor molecule (Pyr-C4-NH3+), which serves as a reference material, but with improved transport between the inorganic layers. And subsequently, we intercalated strong electron acceptors (TCNQ and TCNB), leading to the formation of charge-transfer complexes with the Pyr-C4-NH3+ donor molecules. We will present several examples where the organic cation affects the charge transport properties, the dissociation of exciton and the optical properties.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

nanoGe Perovskite Conferences on Photovoltaics and Optoelectronics (NPERC) celebrated early every year is a combination of two independent events focused on perovskite research. The International Conference on Perovskite Thin Film Photovoltaics ABXPV is the best place to hear the latest on developments in all aspects perovskite solar cells, from fundamental physics and materials properties to a broad set of applications. The International Conference on Perovskite Photonics and Optoelectronics PEROPTO is focused on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

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